Jump to content
SAU Community

Cas Problems And Possible Solutions...

kdwebber

By kdwebber,
in Engines & Forced Induction

 Share

Recommended Posts

kdwebber Apprentice

kdwebber

Posted
Posted

Hey guys first off just like to say that this is an awesome website. I'm more of a lurker/reader but i still find this site very helpfull. There are not many rb25's in Canada which makes this site even more useful.

Anyways I've been having problems with my series 1 rb25det for quite a while now. When the car warms up to about 83-85 celcius the car begins to hesitate and shudder. It almost feels like the car is not getting enough fuel. The car wont stall but it will not move forward either. Eventually the car becomes undriveable and I am forced to limp home pulling over, waiting, and then continuing on my way. After changing couplers, seals, amf's, plugs, fuel filters, cleaning and testing coils among other things I finally changed out my cas and the car ran noticeably better but still far from perfect. Presenly the car runs ok up to about 4500-5000 rpm where there is a noticeable lack of power and the car will not rev any higher. Even after changing the new cas the same problems have come back when the weather outside reaches 25 degrees celcius.

Upon closer inspection the half moon (the part that attatches to the cam) appears to be slightly damaged. I've read that this can cause the timing to be off among other things.

My questions are has anyone else experienced this problem?

Does anyone know what would caues the apparent damage to the half moon?

It appears that the half moon that attatches to the cam can be removed and replaced. Can I order this part from nissan?

Any help or advice would be greatly appreciated.

Link to comment
https://www.sau.com.au/forums/topic/173829-cas-problems-and-possible-solutions/
Share on other sites
kdwebber Apprentice

kdwebber

Posted
  • Author
Posted
fuel pump rooted??

I suspected the fuel pump but the car will run horribly, I will shut off the engine for 10-20 seconds, restart the car and it will hit full boost again until the problem re appears somewhere in the next 2-10 mins.

kdwebber Apprentice

kdwebber

Posted
  • Author
Posted (edited)
fuel pump.

A new fuel pump is definetly a good idea. Not sure if the fuel pump was upgraded when the swap was done, might still have the old r32 pump in there.

Eventhough the fuel pump does need an upgrade sooner than later im almost confident the problem lies with the cas. just curious if anyone has had a similar problem or knows why the damage has occured to the half moon.

Edited by kdwebber
SECURITY Grand Master

SECURITY

Posted
Posted

yeah. what you'll notice if the cas is shagged that it'll be like that constantly as well as have a fair bit of black smoke come out the exhaust (as the fuel wont be firing).

if you feel like you're getting a fair bit of hesitation and it is completely random (not misfire) then its most likely your fuel pump.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • 25RBGT
      Got this r31 silhouette flood car to rebuild.

      By 25RBGT · Posted

      So we have most the interior back in, and for the first time with one OEM speaker hooked up. The 31 is running, driving and now tunes!!! Hahaha yet another step for the sub that sat 10m under for two weeks!!! unbelievable really 👌 lots of love work and not giving up on her. Seen so many youngsters part way less, and in way better condition. I’m stubborn, thinking another problem is just a hurdle to overcome, One at a time. IMG_9277.mov
    • TurboTapin
      CD009 RB Conversion

      By TurboTapin · Posted

      That is correct. I'm using a modified ABS ring and a ZF speed sensor on my rear diff for speed input. I'm running a Haltech ecu. 
    • TurboTapin
      R32 GTST - 600KW+ RB28/CD009 Build

      By TurboTapin · Posted

      Been busy with the newborn. We originally thought we were going to go for a third, but we're good with two lol. He's starting to actually sleep now so I've had some energy to work on the car. It's been parked away in the garage since late November due to winter.  I went ahead and redid all my head oil drains. I originally had my front and rear head drain going into the same pipe but have since split them up. I also added an Ethanol content sensor to get ready to run E85 this summer. Tossed it on my return line. Sensor sits nicely under my intake manifold.    I also have a lot of parts that came in for my rear end. I'll be swapping over to a 3.3 final drive and doing the GK teck anti squat mod. While the rear subframe is off, I'll also change every bushing. We're planning on buying another house soon with the condition that I get at a minimum a 2 door garage, so I'll wait to have more room for this. Now onto the strange things that recently happened... After changing the lower rad hose (It had been sitting in my cabinet for well over a year and was the last hose I had to replace), I let the car idle in the garage to bleed my coolant. After running for a few minutes, it started missing. Got much worst within a minute or two and then stalled and would not restart. My crank sensor decided to crap itself. No damage, no explanation, just died. I went ahead and replaced it with another ZF sensor but the heavier duty stainless model with a shield. Tossed that in and started right up. Has anyone else seen this? I hate when things fail without cause. Luckily this was a blessing in disguise... This lead me to recheck my timing. It seems I may have had a beer or two the last time I had set my TDC angle as I was off exactly 5 degrees... I miscounted a line haha. I was running 5 degrees less then commanded. It's a little embarrassing but helps explain why my dyno operator seemed to think I should be making more then 478rwkws.        
    • hypergear
      Hypergear Turbochargers and High flow Services Development thread

      By hypergear · Posted

      Sharing results from recent Liberty Walk R35 GTR, since they are still considered as somesort of a V36 Skyline. We do them turbos too. This are high flowed SS-1 models with ball bearing conversion done.  Car have managed to pull 485awkws @ 20Psi so far pushing limitations of factory built engine. The build list for R35 GTR enthusiasts as follow : HyperGear high flowed stock turbos in SS1 (G25-660 specs) Custom titanium intake pipes. Vspec performance titanium front pipes. Vspec performance 4" titanium exhaust. Upgrade fuel pumps. 1200cc injectors. Ignition coilpacks Hks intake plenum. Hks intercooler piping. Greddy intercooler. Greddy bovs. Top-secret coolant reservoir. Emtron ecu. Straight E85. Built gear box.  
    • Shoota_77
      Shoota's R33 GT-R RB30/26

      By Shoota_77 · Posted

      Nah no bearings, just slip fit.  Would be a reasonably challenging but not impossible job to modify it to run bearings but I'm hoping that's not necessary as I may have well built one myself if I end up spending hours modifying it!
×
×
  • Create New...